Policy Evaluation Logic
Explore how AWS policy evaluation logic determines access permissions by analyzing identity-based and resource-based policies, IAM permissions boundaries, and more. Understand the key rules like explicit allow, explicit deny, and implicit deny to secure AWS resources effectively.
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Policy evaluation is a critical aspect of managing access to resources within the Amazon Web Services (AWS) environment. AWS employs a sophisticated policy evaluation process to determine whether to allow or deny requests for accessing resources based on the permissions defined in policies.
How policy evaluation works
The evaluation process begins with the request context, which includes information about the actions requested, the AWS resource involved, details about the principal making the request (such as associated policies), environmental data, and resource-specific data.
AWS evaluates policies in a specific order, starting with identity-based policies and progressing through resource-based policies, IAM permissions boundaries, and other policy types. An explicit deny in any policy overrides an allow.
Let’s look ...